Tekumel :: The World of the Petal Throne Give in. Go look at it. Serious mind warping goodness and a rich world that isn't based on the European stories that a lot of the rpg's are based on.
IE no greek gods. Oh there are gods, but they are aztec-y. Yeah that prhase makes me cringe, but it's the best way to describe it. And imagine a world where no one really knows that they used to be super-high-tech world but the remnants are there. It's post holocaust, without those pesky 'day after' syndrome.